This is a cooperative research project involving patients in Medical Oncology Department of Affiliated Cancer Hospital of Xiangya School of Medicine Central South University, and the State Key Laboratory for Natural Medicine and Biomimetic Drugs Perking University. The primary objective is to measure the thioredoxin reductase activity using blood in subjects received platinum based chemotherapy, to study the warning progression ability of thioredoxin reductase in blood. The secondary objective is to compare the warning progression activity of blood thioredoxin reductase reductase activity with carcinoembryonic antigen in subjects received platinum based first-line chemotherapy. Blood will be collected before chemotherapy, after every 2 cycles of chemotherapy, every 3 months after all first-line chemotherapy till 2 years, then every 6 months till 3 years, or collect blood till tumor progression, evaluation CT results every time collecting blood samples.
